How beneficial is it to have r2 Amir for an endgame account ? Worth wishstones ?

I know he’s the best in multi round combat but isn’t that too niche since it’s just sonic rift and event trials ? (Idk if he’s meta in fafnir and I do fine in event trials without him)

The main reason I considered his r2 is new sonic rift eating up memochips like crazy , I’m not sure if my clearing speed is fast enough or if the memochip cost is just that much , how long does it take for r2 Amir teams to clear sonic rift 20 ?

Also I have resonating elif in mind as well so saving them if I decide to use them on elif instead of Amir might be a better long term decision

Although I still feel reluctant to use wishstones generally speaking cause I mostly dedicate them to any esper that is to my liking and ends up strong so that I get to r6 them asap